参数资料
型号: IR3514MTRPBF
厂商: International Rectifier
文件页数: 33/46页
文件大小: 0K
描述: IC XPHASE3 CONTROL HYBRD 40-MLPQ
产品变化通告: (EP) Parts Discontinuation 25/May/2012
标准包装: 1
系列: XPhase3™
应用: 处理器
安装类型: 表面贴装
封装/外壳: 40-MLPQ
供应商设备封装: 40-MLPQ(6x6)
包装: 标准包装
产品目录页面: 1383 (CN2011-ZH PDF)
其它名称: IR3514MTRPBFDKR
IR3514
R FB _ R
V O _ NLOFST
I FB 1
(12)
Adaptive voltage positioning lowers the converter voltage by R O *I O, where R O is the required output impedance of
the converter. Pre-select feedback resistor R FB, and calculate the droop resistor RDRP,
R DRP 11
R FB _ R   R L _ ROOM * G CS
n   R O
(13)
Calculate the desired effective feedback resistor at the maximum temperature R FB_M using (14)
R FB _ M
R DRP 11   R O * n
G CS   R L _ MAX
(14)
A negative temperature constant (NTC) thermistor R THERM1 is required to sense the temperature of the power
stage for the inductor DCR thermal compensation. Pre-select R THERM, R THERM1 must be bigger than R FB_R and
R TMAX1 - NTC thermistor resistance at allowed maximum temperature T MAX must be bigger than R FB_M, R TMAX1
is calculated from (15).
R TMAX 1
R THERM 1 * EXP [ B THERM 1 * (
1
T L _ MAX
 
1
T _ ROOM
)]
(15)
Select the series resistor R FB13 using (16) to linearize the NTC thermistor, which has non-linear characteristics in
the operational temperature range.
R FB 13
( R THERM 1   R TMAX 1 ) 2   4 * ( R THERM 1 * R TMAX 1   ( R THERM 1   R TMAX 1 ) * R FB _ R * R FB _ M /( R FB _ M   R FB _ R ))
2
(16)
Use equation (17) to determine R FB11
1
R FB 11
1
R FB _ R
 
1
R FB 13   R THERM 1
(17)
Page 33 of 46
10/30/2007
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